I just inquired a tube

[tvcollector]

I just got a 12LP4 to replace in a set, I put it on the tester right after I unpacked it when UPS delivered it. I fired up my Sencore CR70. All tests well except when setting the cut off, at first the needle didn't move, than after a minute or two, the needle budged just a tad when moving the cutoff setting control all the way. In the emissions the needle goes well into the good range as adjusting the cutoff setting... All shorts test great too.. Anyone think the cutoff will be a problem? I didn't do any extended cut off testing, as these old tubes seem to be very brittle..